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		<p>合并6和7水平合并：colspan
		   合并15和20垂直合并:rowspan
		</p>
		<p>
			水平合并:保留左边，删除右边
			垂直合并:保留上边，删除下边
		</p>
		<table border="1" width="600px" height="400px">
			<tr>
				<td>单元格1</td>
				<td>单元格2</td>
				<td>单元格3</td>
				<td>单元格4</td>
				<td>单元格5</td>
			</tr>
			<tr>
				<td colspan="2">单元格6</td>
				
				<td rowspan="3">单元格8</td>
				<td>单元格9</td>
				<td>单元格10</td>
			</tr>
			<tr>
				<td colspan="2" rowspan="2">单元格11</td>
			
				
				<td>单元格14</td>
				<td rowspan="2">单元格15</td>
			</tr>
			<tr>
				
				
				<td>单元格19</td>
				
			</tr>
		</table>
		<table border="1" width="600px" height="400px">
			<tr>
				<td>单元格1</td>
				<td>单元格2</td>
				<td>单元格3</td>
				<td>单元格4</td>
				<td>单元格5</td>
			</tr>
			<tr>
				<td>单元格6</td>
				<td>单元格7</td>
				<td>单元格8</td>
				<td>单元格9</td>
				<td>单元格10</td>
			</tr>
			<tr>
				<td>单元格11</td>
				<td>单元格12</td>
				<td>单元格13</td>
				<td>单元格14</td>
				<td>单元格15</td>
			</tr>
			<tr>
				<td>单元格16</td>
				<td>单元格17</td>
				<td>单元格18</td>
				<td>单元格19</td>
				<td>单元格20</td>
			</tr>
		</table>
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